Davin Harrison, 20, was rafting with a group of friends from Brooklyn on Saturday afternoon when he ran into difficulty while swimming beside the raft in the area of rapids near Lumberland in Sullivan County, AP reports.
It is understood that Harrison, who wasn't wearing a life jacket, went under water and didn't resurface. Another person without a life jacket jumped into the rapids in a bid to rescue him, but was saved by a passing raft after he got into trouble.
According to officials, at the time of the accident the water level had risen to 7 feet — 4 feet above average — due to heavy rains Thursday and Friday.
"The river is running strong and muddy," Town of Lumberland fire Chief Eric Robles told reporters.
Search crews over the weekend failed to find the young Irishman. The search was discontinued at about 4pm on Sunday because of murky river water but the body was later found.
Officials say the young man was on a student work visa from Ireland.
The Irish Department of Foreign Affirs has been assisting the family.